Latch operated positive clutch mechanism



Feb. 17, 1948.

A. a. MACHADO LATCH OPERATED POSITIVE CLUTCH IECHANISI F1106 s m 7, 1942 ll lllllllllllllblll ZSnpentbr Aurnmr B. MAcHAm W WA attorney Patented Feb. 17, 1948 LATCH OPERATED POSITIVE CLUTCH MECHANISM Anthony B. Machado, Oakland, Calii., uslgnor to Friden Calculating Machine 00., Inc., a corporation of California Application September 7, 1942, Serial No. 457,537

This invention relates to latch operated, positive clutch mechanism, and more particularly to clutch mechanisms which are operable cyclically. Mechanisms embodying the invention are especially adapted for use in the cyclic driving of calculating machines.

An object of the invention is to provide improved iull cycle positioning means for mechanism of the character referred to. I

Another bject of the invention is to provide full cycle positioning means which operates and becomes efiectlve for centralizing the mechanism only after a driving cycle has been completed.

Other objects and advantages of the invention will be apparent from the following description of a preferred embodiment thereof as illustrated in the accompanyin drawings, in which:

Figure l is a fragmentary plan view of the cyclic drive mechanism and a part of the actuating means.

Figure 2 is a side elevational view of the cyclic clutch with its associated stopping and centralizing means with the parts in full cycle position.

Figure 3 is a view similar to Figure 2, showing the parts just after engagement of the clutch for performance of a calculation.

Figure 4 is a view similar to Figures 2 and 3, but illustrating the position of the parts as the actuating mechanism is being stopped at the end of a machine operation.

The machine includes a transverse drive shaft 66 (Fig. l) which is connected by beveled gearing to parallel shafts 61 having actuating means 58 thereon. Shaft 66 is cyclically operated and is adapted to be connected to a motor (not shown) by means of a pawl and ratchet clutch. the ratchet 69 (Fig. 2) of which is the driving element and connected to themotor. Ratchet 69 is disposed inside the driven portion of the clutch including disc H (Figures 1 and 2) secured on shaft 86 and a ring 12 secured in spaced relation from the disc I I. To establish a driving relation between the ratchet 59 and the driven assembly including disc 1| and ring 12 a clutch pawl or dog 73 is pivoted at ll on the driven member of the clutch and has sprin 16 attached to its other end to urge it toward the ratchet 69 so thatits tooth 11 will engage with the teeth of the ratchet. At its free end the dog 13 is provided with a shoulder 18 for engagement by the nose of a clutch control lever 19 ivoted at 8i and having a link 82 connected thereto at 88. Link 82 forms part of a suitable linkage by means of which the clutch control lever 19 may be bperated, Lever I8 is sprinlg-urged to the position shown in Figures 2 and Depression of any operating key serves to rock clutch control lever 19 clockwise from the position shown in Figure 2 to its position as shown in Figure 3 to start operation of the machine by re- Claims. (Cl. 192.-28)

leasing dog 18. When clutch dog 18 is released,

it moves under the urgency of spring 18 to engage its tooth 11 with one of the teeth or ratchet 68.

During rotation of the clutch the control lever 5 19 is maintained rocked'to its clutch engaging position for substantially a full cycle (irrespective of release of the lever 19) by the engagement of roller 88 with the periphery of ring 12. In the full cycle position 01 the parts, roller 83 seats in depression 8| in'the ring I! which is ofsufliclent extent to allow clutch control lever 19 to rock inwardly as the clutch driven ring'l! approaches I full cycle position so that the nose of clutch control lever 18 can engage end surface 18 of the 15 clutch dog 13, to cause radial outward movement ple, the dog is free to rock about its pivot 14 against. the tension of spring I8 so that the dog moves radially outward with respect to the clutch. This radial. movement is utilized to control its stopping and centralizing in full cycle position,

Associated with the clutch control lever 18 in the stopping and centralizing of the actuating meansin full cycle position is a lever 86 (Fig. 2), 3 pivoted at 81 and urged against the stop 89 by a strong spring 88. The lever 86 is located in opposed relation to the clutch control lever 19 with respect to the parts of the clutch and particularly the clutch dog I3 which in the fullcycle position shown in Figure 2, slightly clears the rounded end or lever 88 adjacent thereto. As seen in Figure 3 where the clutch is engaged and the dog .13 is in its iurthest radially inward position, the nose of lever 86 is entirely out of the path of dog 18 so that as long as the parts are rotating the lever 88 will not be engaged-by the dog 13.

When the clutch control lever 18 is allowed to rock under the urgency of its spring and under control of ring 12 to the position shown in a Figure 4 to cause disengagement of the clutch,

the nose of the lever moves into the path of the end face 18 of the clutch dog 13 so that the dog 18 is rocked radially outwardly to disengage tooth 11 from ratchet 88. The clutch overdrives beyond full-cycle position under the momentum of the parts and as the dog 13 moves radially outwardly beyond its normal outward position shown in Figure 2 it engages the lever 86 which provides a resilient abutment or stop therefor.

Thus the clutch control lever 19 and the lever 88 together serve to stop the driven parts ofthe clutch adjacent iull cycle position. The strength of the spring 88 is preferably such that in the stopping operation the lever 88' will be rocked so slightly about its pivot and off of its stop pin '89.

or its spring 80 to cause a slight counterclockwise rotation oi the clutch driven parts and aid the roller 83 in centralizing such parts as shown in Figure 4.

I claim:

1. A clutch including a driving part and a driven part, said driven part including an element movable radially inwardly and outwardly to establish or break the drive, and means for stopping and centralizing the driven part of the clutch in the full cyclqposition thereof including a member movable into the: path of said element to cause radially outward movement thereof and yieldabie means engageable by said element upon said outward movement thereof to aid said memher in stopping and centralizing said driven part 01 said clutch.

2. A clutch including a driving part and a. driven part, said driven part including an element movable radially inwardly and outwardly to establish or break the drive, and means for stopping and centralizing the driven part of the clutch in the full cycle position thereof including a member movable into the path 01 said element to cause radially outward movement thereof and yieldabie means engageable by said element upon said outward movement thereof, said last-named yieldabie means yieldably urging said driven clutch 'part to its full-cycle position during the stopping operation.

3. The combination with a clutch. having a rotary driving element and a driven element, a member carried by said driven element for controlling the driving connection between said elements, said member being movable toward the axis of rotation of said driving element to make the driving connection and being movable away from the axis to break the connection, means for disengaging said clutch and for bringing the driven element thereof to rest in a single full- 7 cycle position, comprising a stop to engage said member and cause it to move away from the axis of rotation, and resilient means to engage said member upon overrunning of said driven element beyond lull-cycle position for urging said driven elem toward full-cycle position.

4. The combination with a pawl-and-ratchet clutch including a driving ratchet and a driven element equipped with a pawl engageable with said ratchet, of means for arresting said driven element in a single full-cycle position comprising stopping means to engage the pawl to disenga e it from the ratchet, and a yieldabie member adapted to be engaged by the pawl after it has been engaged by said stopping means for urging the driven elementot full-cycle position.

5. The combination with a pawl-and-ratchet clutch including a driving ratchet, a driven element, and a pawl pivoted on the driven element and being engageable with said ratchet, of means for arresting said driven element in a single fullcycle position, comprising a stop movable to engage a shoulder on said pawl upon arrival of the driven element in full-cycle position, a

. spring-pressed member, said member being arranged with respect to said clutch so that upon overrunning of said drive element beyond fullcycle position after said stop has engaged said shoulder on said pawl a portion of said pawl intermediate the pivot thereof and said shoulder engages said spring-pressed member, whereby said spring-pressed member acting through said pawl urges said driven element to full-cycle position.

AN'I'HONY B. MACHADO.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS '40 Number Name Date 1,730,014 Reece Oct. 1, 1929 1,972,978 Carroll et al. Sept. 11, 1934 2,010,642 Pierce Aug. 6, 1935 2,294,112 Friden Aug. 25, 1942 2,313,817 Friden Mar. 16, 1943 the clutch toward. 

